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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c95b8839b370c5bbd08c026c200d67e719847e573573eaf4e5f46403a95dfd5' 
  AND token = 'bFFXXIpf4ktfC+nYc86xjEXSv6/Os659XfHzhkalEN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}